The Sonos Play:5 is the original (and flagship) wireless Hi-Fi unit from Sonos, the system that allows you to wirelessly stream your own music or that from many available streaming services anywhere in the house. Normally $399 and rarely discounted, this week Best Buy is selling it for $299 (the same price as the smaller Play:3). If you've ever been interested in digging in with Sonos, this is an excellent time to do it.